Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario descargar pdf (Pagina 86)

7 DETAILS OF INSTRUCTIONS

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

halt

Function

HALT

Standard) Sets the processor to HALT mode

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 0

0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0

0x0080

Flag

IE C V Z N

– – – – –

Mode

–

CLK

Five cycles

Description

Sets the processor to HALT mode for power saving.

Program execution is halted at the same time that the C33 PE Core executes the

halt instruction,

and the processor enters HALT mode.

HALT mode commonly turns off only the C33 PE Core operation, note, however that modules to be

turned off depend on the implementation of the clock control circuit outside the core.

Initial reset is one cause that can bring the processor out of HALT mode. Other causes depend on

the implementation of the clock control circuit outside the C33 PE Core.

Initial reset, maskable external interrupts, NMI, and debug exceptions are commonly used for

canceling HALT mode.

The interrupt enable/disable status set in the processor does not affect the cancellation of HALT

mode even if an interrupt signal is used as the cancellation. In other words, interrupt signals are

able to cancel HALT mode even if the IE flag in PSR or the interrupt enable bits in the interrupt

controller (depending on the implementation) are set to disable interrupts.

When the processor is taken out of HALT mode using an interrupt that has been enabled (by the

interrupt controller and IE flag), the corresponding interrupt handler routine is executed. Therefore,

when the interrupt handler routine is terminated by the

reti instruction, the processor returns to

the instruction next to

halt.

When the interrupt has been disabled, the processor restarts the program from the instruction next

to halt after the processor is taken out of HALT mode.

Refer to the technical manual of each model for details of HALT mode.

Example

halt ; Sets the processor in HALT mode.

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 180 181

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